This case study details how FixFinder, a security-focused managed service provider, stopped a sophisticated fileless malware attack targeting a fully remote, research-driven organization with 200 employees. The incident began with a seemingly benign after-hours PowerShell alert flagged by the SOC, while endpoint and email security tools showed no detections. Suspecting a stealth attack, FixFinder pivoted to DNSFilter’s real-time DNS logs, which revealed malicious web activity tied to a fake CAPTCHA lure hosted on newly registered domains. DNSFilter blocked the malware payload before any data reached the endpoint, even though the attack was executed outside the browser. The MSP quickly added the malicious domains to a global block list and submitted them for AI classification, protecting al

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